I've got this error message too. It happens to an ability that targeting point and launching missile. I tried tinkering with site operations of the attack actor - no success. I remembered that Tychus launches grenade, and went to see how is it implemented. But found out that Tychus toss grenade attack from the campaign throws this error too. I also checked infestor's infested terran launch actor, but it targets created unit, and there's no error. I don't want to create a dummy unit as a target, I want to find a solution for the pure targeting point situation.
1. Does anyone know how to launch a missile to the ground and not get this error?
2. Can anyone name some unit, maybe from later campaigns, which launches a missile to the ground. Maybe they implemented it differently in later expansions and there's solution somwhere.
Ravager's ability it's a missile targeting the ground. I don't really know if that's what you seeking but it's the first thing that comes to my mind when you speak about "missile targeting the ground". EDIT: I remember having done things like this when I used to map-making. Another example is one of the Archangel abilties from Heart of the Swarm.
It looks like system determines impact point height as 7.9998 due to fixed value imprecision. So, everything probably works ok. But feels like if we use some site operation with a little height offset, it will work as intended. I tried all I thought may work - different site operations or other actor tinkering. But nothing worked ;/
how's that? i tested it with tychus grenade toss and it worked flawlessly. Try to set impact point site operation (in action actor) to SOpShadow too. It must work......... -_-
hm, it is weird i did it again and now it doesn't work, wtf.....
edit 2: Ok man i realy don't know what is this trash :D but it's working only with LotV campaign dependencies. If you using WoL campaign dependencies it does not work. Seems that it is some conflict connected with an abscense of this property (Validate Benign flag) of Launch Missile effect in WoL build.... i dunno.
Setting impact point site operation to SOpShadow doesn't fix it either, but also it causes the missile to fly under caster's feet instead of aimed target. I think editor performing its revenge to me for shitting on it by moving to unity.
There's slight randomness in this problem, based on the imprecision of fixed number. When terrain height is 8, it's being rounded to 7.9997, which is < 8, and the problem emerges. I can imagine a situation where terrain height is 7.9, and it's rounded to something like 7.9002, and error wouldn't happen.